diff options
Diffstat (limited to 'vendor/github.com/google/gopacket/layers/ipsec.go')
-rw-r--r-- | vendor/github.com/google/gopacket/layers/ipsec.go | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/vendor/github.com/google/gopacket/layers/ipsec.go b/vendor/github.com/google/gopacket/layers/ipsec.go new file mode 100644 index 0000000..19163fa --- /dev/null +++ b/vendor/github.com/google/gopacket/layers/ipsec.go @@ -0,0 +1,68 @@ +// Copyright 2012 Google, Inc. All rights reserved. +// +// Use of this source code is governed by a BSD-style license +// that can be found in the LICENSE file in the root of the source +// tree. + +package layers + +import ( + "encoding/binary" + "github.com/google/gopacket" +) + +// IPSecAH is the authentication header for IPv4/6 defined in +// http://tools.ietf.org/html/rfc2402 +type IPSecAH struct { + // While the auth header can be used for both IPv4 and v6, its format is that of + // an IPv6 extension (NextHeader, PayloadLength, etc...), so we use ipv6ExtensionBase + // to build it. + ipv6ExtensionBase + Reserved uint16 + SPI, Seq uint32 + AuthenticationData []byte +} + +// LayerType returns LayerTypeIPSecAH. +func (i *IPSecAH) LayerType() gopacket.LayerType { return LayerTypeIPSecAH } + +func decodeIPSecAH(data []byte, p gopacket.PacketBuilder) error { + i := &IPSecAH{ + ipv6ExtensionBase: ipv6ExtensionBase{ + NextHeader: IPProtocol(data[0]), + HeaderLength: data[1], + }, + Reserved: binary.BigEndian.Uint16(data[2:4]), + SPI: binary.BigEndian.Uint32(data[4:8]), + Seq: binary.BigEndian.Uint32(data[8:12]), + } + i.ActualLength = (int(i.HeaderLength) + 2) * 4 + i.AuthenticationData = data[12:i.ActualLength] + i.Contents = data[:i.ActualLength] + i.Payload = data[i.ActualLength:] + p.AddLayer(i) + return p.NextDecoder(i.NextHeader) +} + +// IPSecESP is the encapsulating security payload defined in +// http://tools.ietf.org/html/rfc2406 +type IPSecESP struct { + BaseLayer + SPI, Seq uint32 + // Encrypted contains the encrypted set of bytes sent in an ESP + Encrypted []byte +} + +// LayerType returns LayerTypeIPSecESP. +func (i *IPSecESP) LayerType() gopacket.LayerType { return LayerTypeIPSecESP } + +func decodeIPSecESP(data []byte, p gopacket.PacketBuilder) error { + i := &IPSecESP{ + BaseLayer: BaseLayer{data, nil}, + SPI: binary.BigEndian.Uint32(data[:4]), + Seq: binary.BigEndian.Uint32(data[4:8]), + Encrypted: data[8:], + } + p.AddLayer(i) + return nil +} |